docs: def spkw20(handle, body, center, inframe, first, last, segid, intlen, n, polydg, cdata, dscale, tscale, initjd, initfr):
      """
      Write a type 20 segment to an SPK file.
  
      https://naif.jpl.nasa.gov/pub/naif/toolkit_docs/C/cspice/spkw20_c.html
  
      :param handle: Handle of an SPK file open for writing.
      :type handle: int
      :param body: Body code for ephemeris object.
      :type body: int
      :param center: Body code for the center of motion of the body.
      :type center: int
      :param inframe: The reference frame of the states.
      :type inframe: str
      :param first: First valid time for which states can be computed.
      :type first: float
      :param last: Last valid time for which states can be computed.
      :type last: float
      :param segid: Segment identifier.
      :type segid: str
      :param intlen: Length of time covered by logical record (days).
      :param n: Number of logical records in segment.
      :param polydg: Chebyshev polynomial degree.
      :param cdata: Array of Chebyshev coefficients and positions.
      :param dscale: Distance scale of data.
      :param tscale: Time scale of data.
      :param initjd: Integer part of begin time (TDB Julian date) of first record.
      :param initfr: Fractional part of begin time (TDB Julian date) of first record.
      """
      handle  = ctypes.c_int(handle)
      body    = ctypes.c_int(body)
      center  = ctypes.c_int(center)
      inframe = stypes.stringToCharP(inframe)
      first   = ctypes.c_double(first)
      last    = ctypes.c_double(last)
      segid   = stypes.stringToCharP(segid)
      intlen  = ctypes.c_double(intlen)
      n       = ctypes.c_int(n)
      polydg  = ctypes.c_int(polydg)
      cdata   = stypes.toDoubleVector(cdata)
      dscale  = ctypes.c_double(dscale)
      tscale  = ctypes.c_double(tscale)
      initjd  = ctypes.c_double(initjd)
      initfr  = ctypes.c_double(initfr)
      libspice.spkw20_c(handle, body, center, inframe, first, last, segid, intlen, n, polydg, cdata, dscale, tscale, initjd, initfr)